<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../js/vue.js"></script>
</head>

<body>
  <div id="root">
    <h2>今天天气很{{info}}</h2><br>
    <button @click="changeWeather">改变天气</button>
  </div>
  <script type="text/javascript">
    new Vue({
      el: '#root',
      data: {
        isHot: true
      },
      computed: {
        info() {
          return this.isHot ? '炎热' : '凉爽';
        }
      },
      methods: {
        changeWeather() {
          this.isHot = !this.isHot;
        }
      }
    })
  </script>
</body>

</html>